Electromagnetic switch.



and 3.-1 of insulating material. by means of which and screws --G and 7- S passing through base B and screwed into said ends, the said coils are iirmly maintained in place. 'As stated before. the solenoids are in true axial alinement and passing through their axial openings and fixed therein against longitudinal movement is a common tube f/ of non-magnetic material such as brass. The upper half of the circumference of this tube, between the ends 2 and 3 of the coils C and C, is out away as at 10, the length of which cut out is equal'tov the predetermined travel of `a continuous solenoid core 11 plus the width of a cross bar 12, which bar is fixed to the core 11 by a suitable screw 13, or other means, at a point medially of the length of said core.

Projecting laterally from base B, on each side thereof. medially about its transverse center line are lip's D and D, whose top surfaces' are on a slightly lower plane than that of said base. Fixed tothe upper faces of aforesaid lips parallel to and eq'uidistant from the longitudinal center line of the base B are non-magnetic, stationaryAline contactbars 15 and 15 and 14 and 1-1. The rst named are fixed to lip D by screws 16 or equivalent fastening and areinsulated from `said lip by approved insulating material 17.

They are also insulated from each other by similar lnsula'tlon 1S. 'Bars 11 and 11 are attached Ato lip D by fasteners 16, insulated *from said lip by insulation 17, and from ich other bylike material 18. Throughout the drawings bars 15 and 15 are indicated as of negative and `bars 11 and 14 as of positive, polarity, it being understood that my device is intended to make or break both laids of an all metallic circuit. At the ends of bars 15 and 15 are suitable binding posts 19 and 19 for evident purposes, while like posts 2t) and 20 perform the same func tions for bars 14 and 14 (lross bar 12 on solenoid core 11 extends transversely of said col'e an equal distance on both sides of the axis thereof, to a. point above and beyond bars 15`-l5 and lll-14% Directly above these said bars` parallel thereto, aml in alinement therewith, and tixed to the under side of the opposite ends 21 and 22 y of cross bar 12, by means of duly insulated fasteners 21" and 22", are short longitudinal non-magneticbars 21*L and 22, which same are insulated from cross bar 12 by suitable material 23 and 23, Said bars 2l and 22 .are possessed at oneend of carbon holders 24 and 24 having carbon blocks 25 and 252 the solenoid core 12 is traveling 1n a direction to close the main line circuit, these' carbon blocks contact with similar blocks 2G and 2li, maintained in holders 27 and 27, which holders are attached to rods 28 and 28, supported in .brackets 2t and 29 in a horizontal plane. Said brackets are in elecis closed.

trical connection with the line Contact bars 11 and 15. and the rods 2S and 28 are pro vided with helical or blade springs 30 and 30 so arranged as to otl'er resistance to the advance of cal-bons and 25.

Depending from the .bars 21 and 22 on cross bar 12 are studs 31--tl2 and 31 and respectively, which studs are firmly fastened into their respective plates.l but are per mitted to loosely project into apertures 33 and 31 formed in sliding contact blocks 35 and 3l). which blocks are slidable alon,f r the upper faces of line contact bars 13 and 15 and 14 and 115. Springs 3T are provided to embrace rods ill-82 and 31 and 32, so as to create a shght pressure ol contact between the contact blocks and their respective con-` tact plates to secure a good electrical conneetion. Attention is no w directed to the fact 25--26 and 25-2t3, have already tontzuftcd. thereby preventing any tendency of the electrical current to "arc" as the metallic circuit 1na word these carbons are the lirst to contact and the last to break contact, the result being a much longer `life to and more perfect electric connection with the arious metallic contacts due 'to th. absence of arcing.

In Fig. 5 is disclosed in detail the lnechanical construction of the pole changing switch employed in my invention. 1t consists, lirst of all, of a tlat rectangular plate produced from, liber. vulcanitc` or other l approved insulating' material. '.lhis plate is of a size both longitudinally and laterally to just lit between the solenoid 'coils C and C on the base l. to which it is attached by screws 51 and 52. t`cntrally of *this plate, which is also practically the longitudinal and transverse center of the said base l thert` is located a vertical pivot or fulcrum l formed by a bolt and lult. lotatably mounted on this pivot is a cam levcr 54. the larger arc ot' which extends for practically half a revolution or N00 and then sharply reduces to an arc 5G of. smaller diameter, which latter arc merges into an upwardly extending shank 57: the latter terminating in a horizontally disposed end 5S possessed ot a longitudinal slot 59. Depending from cross bar l2 on solenoid core 11 there is a. thoroughly insulated stud tt), which stud engages the slot 5*.) in ea'm lever .54, so that as the core l1 is caused to travel llt) over the insulations 18 and .15, cal-bons,

the rear of plate 50 directly opposite fastening screws 51-52 are binding posts 61 and 6:2, the former of which is connected to the terminal lead of 61 from the solenoid C and the latter to a similarlead `62a from solenoid Cu. Both of said binding posts have carbon contact pieces 61b and 62", respectively, which are adopted to alternately contact with similar members 63 and 633,011 fiat blade springs 64C and Gr. The opposite ends of these springs are fixed to and'in electrical connection with a metallic bar`65 fixed to the front end of plate 50 by screws 66 or equivalents thereof.

the flat blade springs 64 and 64, fixed to the same or made a part thereof, and adapted to contact with the cam portions of cam lever 54, are provided triangular projections 66 and 66% The relationship of these parts is such that when the said cam lever 54 is oscillated in a direction to break the contact between carbons 62" and 63a, before this Contact is broken, carbons 63 and 61b have already entered into electrical engagement and vice versa in a manner readily comprehended.

l will now describe the wiring diagram 6 and the cycle of functions performed by my switch. It is first assumed that a negative lead 100 from the source of electrical energy is connected to contact bar 15 and a lead of like lpolarity 101 emerges from bar 15?. l, Also that a positive lead 100a is connected to bar 14 and a wire 101a of the sameA polarity emerges away from bar 14n. It is also assumed that the flow of electrical energy is in the direction of the arrow pointer 110, so that the left hand side of the diagram is the live end thereof. A. conductor 102 is now taken from lead 100 and connected to switch 103. A conductor 104 from the pole of said switch marked open is connected to the negative binding post 107 of solenoid CL. A conductor 105 from the switch pole marked closed7 is led to negative binding' post 106 on coil C. A conductor 108 is led from bar 65 to positive lead 1002.

Control switch 103 is shown in closed position and it will be observed that sliding blocks 35 and 36 have bridged the insulations 18 and 18a and have closed the main line circuit. But now trace the shunt circuit to coils C and Cf: conductor 105 leads from' the closed pole of the 'control switch to negative binding post 106 of the said coil"` Wire 61L leads to post 61 where a break occurs, declaring the coil C as dead. And it is self evident that coil Ca is dead because of the break at the switch 103. If now the switch lever of'` switch 103 be shifted to openf current will flow through wire'lO-t, coil Ca,'wire 62a, contacts 62b and 63, blade spring 64, bar 65, and wire 108 back 'to positive lead 100g, closing the shunt circuit to coil CfL and energizing the same. Instantaneously corell is attracted and contact blocks 35 and 36 removed from contact with bars 11 and 15, thereby opening the main line circuit. Simultaneously with this, the contact between 62 and 63 has been broken, thus denergizing coil Ca. As the Contact between 62 and 63a breaks, Contact 61 and 63 is formed, placing coil C in due form for the next reversal of controlling switch 103.

It is now to be stated that my switch may be used in either direct or alternating current lines, either of high or low potential as may be desired. Approximately medially of the length of v W'hile herein I have disclosed the preferred mode of practising my invention l desire it understood that I may make such changes as might suggest themselves to one skilled in the art or permitted under the doctrine of mechanical equivalents.

Having thus fully described my invention, I claim as new and desire to secure to inyself by Letters Patent of the United States 1. In combination, two alined stationary contact pieces separated from each other at their adjacent ends, an actuating member movable parallel with the direction of the length of said stationary contact pieces, a Contact block yieldingly supported on said actuating member and movable from a position in which it electrically connects the stationary contact pieces together to a position in which it is out of engagement with one of the stationary contact pieces, an arm projecting laterally from the latter stationary contact piece, a stem supported by said arm so as to be movable in the direction of the length of the stationary Contact pieces, an auxiliary Contact carried by said stem, a coperating auxiliary contact carried by said actuating member and electrically connected to the aforesaid contact block, and a spring acting on said stem and tending normally to hold the auxiliary contact carried by the stem in a position to cause the auxiliary contacts to engage with each other before the contact block engages with the stationary contact piece ou which the stem is mounted and to maintain the auxiliary contacts in engagement with each other until after the contact block has passed out of engagement with the last mentioned stationary contact piece.

2. IIL an electro-magnetic switch, sepa- 1 `--rated alined actuating coils, a core extending into and movable axially of the coils, a "main, switch including a movable contact member connected to the core; two controlling switches lying on one side of the core between said coils, each controlling switch c mprising awstationary contact and a spring actuated movable contact tending normally ,to .move out of engagement with the stationf/'ary Contact; a cam lying between said spring actuated movable contacts and having tw4` positions in euch of which it closes one of the controlling switches sind allows the other to remain open; and a Connection between sfu-id eem` and said core for shifting Said cam from one position to the other just before the core reaches the limits of its monments.

3. In combination, two alinecl stationary Contact pieces Separated from each other :it their adjacent ends, :1 member lying above nnd'movaible in the direction of the length of Seid Stationary Contact pieces, zi contact block, :i spring between said Contact block and said member, un auxiliary Contact eon neeted to one stationary contact piece, a eee- IV. O. STARK, A. N. LURIE.

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